Fix nimsuggest not suggesting fields in when theres static parameters (#21189)

Don't check against empty arguments

Add test case

nimsuggest/tests/t21185.nim

@@ -0,0 +1,18 @@
+
+# Reduced case of 21185. Issue was first parameter being static
+proc foo(x: static[int]) = discard
+
+type
+  Person = object
+    name: string
+    age: int
+
+let p = Person()
+p.#[!]#
+
+discard """
+$nimsuggest --tester --v3 --maxresults:2 $file
+>sug $1
+sug;;skField;;age;;int;;$file;;8;;4;;"";;100;;None
+sug;;skField;;name;;string;;$file;;7;;4;;"";;100;;None
+"""